Atomic Theory And Subatomic Particles Page 4
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4Part 3: Molar Conversions -
Complete Molar Conversion Problems on Chapter 3
Worksheet
Part 4:
1. Calculate the average atomic mass of Carbon.
12
13
C
C
6
6
Actual Mass
Actual Mass
12.000000 amu
13.003355 amu
98.90% abundant
1.10% abundant
2.
D etermine
t he
a verage
a tomic
m ass
o f
t he
f ollowing:
There
a re
4
i sotopes
o f
a n
u nknown
e lement.
I f
o ut
o f
1 00
a toms,
2 8
h ave
a
m ass
o f
1 71
AMU,
4 5
h ave
a
m ass
o f
1 72
A MU,
1 2
h ave
a
m ass
o f
1 74
A MU
a nd
1 5
h ave
a
m ass
o f
1 78
AMU.
3.
D etermine
t he
p ercent
o f
e ach
i sotope
i n
t he
f ollowing:
There
a re
2
s table
i sotopes
o f
W arriorium.
W arriorium-‐258
a nd
W arriorium-‐267
h ave
a n
average
a tomic
m ass
o f
2 64.275
A MU.
4.
D etermine
t he
m olar
m ass
o f
t he
f ollowing:
KClO
g/mol
Pb(SO
)
g/mol
4
4
2
SnI
g/mol
(NH
)
PO
g/mol
4
4
3
4
CBr
g/mol
4
5.
F ill
i n
t he
f ollowing
m issing
p arts
t o
t he
c hart:
( copy
c hart
i f
o n
p aper)
Symbol
p+
e -‐
n
Mass
#
Atomic
#
o
O-‐16
F
1 0
I
7 4
5 0
6 9
7 5
1 11
U
1 45
6.
C onvert
t he
f ollowing:
36.03
g
C
atoms
C
2.408
X
1 0
f ormula
u nits
N aCl
g
N aCl
24
.25
m oles
H
O
g
H
O
2
2
12.67
m oles
C
H
O
molecules
C
H
O
6
12
6
6
12
6
1000
g
C l
molecules
C l
2
2
3.01
X
1 0
a toms
o f
A u
grams
A u
25
*
Q uestion
t aken
f rom:
D avis,
R .E.,
F rey,
R .,
S arquis,
M ,
S arquis,
J .L.
( 2006).
M odern
Chemistry
A ustin,
T X:
H olt,
R inehart
a nd
W inston
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